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Thioridazine-d3 is intended for use as an internal standard for the quantification of thioridazine by GC- or LC-MS. Thioridazine is a typical antipsychotic.1 It binds to dopamine D2, histamine H1, M3 muscarinic, and α1- and α2-adrenergic receptors (Kis = 5-341.3 nM), as well as the serotonin (5-HT) receptor subtypes 5-HT1A, 5-HT2A, 5-HT2C, 5-HT6, and 5-HT7 (Kis = 10-180.7 nM). Thioridazine (5 mg/kg) reduces amphetamine-induced repetitive head bobbing and oral behavior in rats.2 It reduces conditioned fear stress-induced freezing behavior in rats when administered at doses ranging from 3 to 100 mg/kg.3 Thioridazine is also active against multidrug-resistant tuberculosis in vitro and in vivo.4

1.Kroeze, W.K., Hufeisen, S.J., Popadak, B.A., et al.H1-histamine receptor affinity predicts short-term weight gain for typical and atypical antipsychotic drugsNeuropsychopharmacology28(3)519-526(2003) 2.Tschanz, J.T., and Rebec, G.V.Atypical antipsychotic drugs block selective components of amphetamine-induced stereotypyPharmacol. Biochem. Behav.31(3)519-522(1988) 3.Ishida-Tokuda, K., Ohno, Y., Sakamoto, H., et al.Evaluation of perospirone (SM-9018), a novel serotonin-2 and dopamine-2 receptor antagonist, and other antipsychotics in the conditioned fear stress-induced freezing behavior model in ratsJpn. J. Pharmacol.72(2)119-126(1996) 4.Amaral, L.Thioridazine: An old neuroleptic effective against totally drug resistant tuberculosisActa Med. Port.25(2)118-121(2012)

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